* {
    margin: 0;
    padding: 0;
}
.btn {
    height: 32px;
    padding: 0 15px;
    text-align: center;
    font-size: 14px;
    line-height: 32px;
    color: #fff;
    border: none;
    background: #1890ff;
    border-radius: 2px;
    cursor: pointer;
}
.mask {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    background: rgba(0, 0, 0, 0.6);
    animation: fadeIn 0.3s forwards;
}
.slide-box {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 15px;
    border-radius: 10px 10px 0 0;
    background: #fff;
    user-select: none;
}
.fade-in {
    animation: fadeIn 0.3s forwards;
}
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}
.fade-out {
    animation: fadeOut 0.3s forwards;
}
@keyframes fadeOut {
    from {
        opacity: 10;
    }
    to {
        opacity: 0;
    }
}
.slide-up {
    animation: slideUp 0.3s forwards;
}
@keyframes slideUp {
    from {
        transform: translate3d(0, 100%, 0);
    }
    to {
        transform: translate3d(0, 0, 0);
    }
}
.slide-down {
    animation: slideDown 0.3s forwards;
}
@keyframes slideDown {
    from {
        transform: translate3d(0, 0, 0);
    }
    to {
        transform: translate3d(0, 100%, 0);
    }
}
h4 {
    height: 24px;
    margin-bottom: 16px;
    font-size: 16px;
    line-height: 24px;
    text-align: center;
}
.picker-group {
    display: flex;
}
.picker-column {
    position: relative;
    flex: 1;
    height: 200px;
    margin: 0 auto;
    overflow: hidden;
    touch-action: none;
}
.picker-column::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1;
    height: 79px;
    border-bottom: 1px solid #ebebeb;
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0.9),
        rgba(255, 255, 255, 0.6)
    );
}
.picker-column::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1;
    height: 79px;
    border-top: 1px solid #ebebeb;
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0.6),
        rgba(255, 255, 255, 0.9)
    );
}
li {
    list-style: none;
    font-size: 14px;
    line-height: 40px;
    text-align: center;
}
.btn-sure {
    display: block;
    margin: 15px auto 0;
}
